Weird Faces, Paranormal?

by Tina
(PA)

I took my granddaughters to walk the Gettysburg battlefield. While snapping pics I caught something in a few of them. These were at Little Round Top. I didn't see anything until I uploaded the pic on the computer, then the one kind of freaked me out.(My eyes being what they are, I had to zoom in to see clearly something my sis in law pointed out.)

Can anyone tell me what the faces really are? I'm looking to debunk them as supernatural, but I'm not an expert in these things.

Thanks for your help.